Wrench



R. WOLFE.

(N0 Model.)

WRENCH.

No. 330,453. Patented Nov. 17, 1885.

,2 ma/ f 12C f le AreNr FFICEQ ROBERT WOLFE, OF WATERBURY, CONNECTICUT.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 330,453, dated November 17,1885.

Application filed July 21, 1885.

To all whom, it may concern:

Be it known that I, ROBERT WOLFE, of the city of Vaterbury, in the county of New Haven and State of Connecticut, have invented new and useful Improvements in Tap- Wrenches, of which the following is a specification.

The object of my invention is to provide a strong and simple adjustable tap-wrench.

The invention consists in the novel arrangement of an adjusting-screw through the wrench-handle, and in means for securing the jaws of the wrench, all as hereinafter more fully described and claimed.

In the accompanying drawings, Figure 1 is a View of my improved wrench, drawn partly in section to show the adjusting-screw; and Fig. 2 is a side view of the body of the wrench. Fig. 3 is a view of one of the jaws, and Fig. 4 shows the dovetailed key for securing the jaw. Fig. 5 is a section across the jaw on the linex x, Fig. 3; and Fig. 6 is a longitudinal section through the jaw on the line y y, Fig. 5.

Referring to the drawings, A designates the body of the wrench,formed oblong, as shown, with opposite projecting handles,B B. Centrally within the body A isa rectangular slot, C, in which the wrench-jaws d d are arranged. The meeting ends of the jaws are notched, as shown, to receive the square part of a tapshank. Each jaw has a transverse dovetailed groove, e, across one face, and lateral anges f at each side of the opposite face. Dovetailed keys g g are fitted to drive snugly in the grooves e, with their ends projecting beyond the sides of the jaws, thus forming flanges for retaining the' jaws in the slot C. When the jaws are arranged in the wrench,

the flanges f bear on one side of the body A f and the projecting ends of the keys bear upon the opposite side thereof, and the jaws are thereby held securely in place. By withdrawing the keys g g both jaws may readily be removed from the wrench. One handle, B', of the wrench is axially perforated throughout its length, and has an internal or female thread, h, near its middle part. Between the threaded part and the end of the handle the perforation is slightly larger than the greatest diameter of the thread, and from the threaded Serial No. 172,251. No model.)

part to the slot C the perforation is somewhat smaller than the smallest diameter of the thread. A screw-rod, l, is accurately fitted within the perforated handle, and has a threaded part, m, which screws into the correspond- L ing threaded part of the handle. The outer end of the screw-rod projects beyond thehandle, and terminates ina knurled knob, n, by means of which it may be turned. The opposite end of the rod projects within the slot C, and is received in a socket, P, in the end of the jaw d. A circumferential groove, r, is formed around the rod near its end, and a pin, t, is fitted through the jaw at the side of the rod and rests within the groove, thus securing the end of the rod to the jaw. The pin t is fitted into the jaw underneath the key, and, therefore, when the key is in position the pin cannot become loose or be removed from the jaw.

In operation, as the screwZ is turned the adjustable jaw d is moved to and fro in the slot C, and as the opposite jaw, d, remains stationary, the opening between the jaws is correspondingly contracted or increased, and thereby adapted for different-sized taps.

In ordinary tap-wrenches the handle screws .through the body to adjust the jaw, and is therefore weakened at the point of greatest strain.

The advantages of Vmy improved wrench are that it is strong and simple, that the parts are not liable to become loose, and that the jaws have a liberal length of bearing on the tapshank, as they may project any desired distance beyond the faces of the wrench.

As indicated hereinbefore, it is both old and very objectionable to make the adjustingscrew for the movable jaw in tap-wrenches form one of the handles by which it is to be operated. I do not, then, desire or intend to cover wrenches so made by my claims herein.

I desire to secure by Letters Patent- 1. In a tap-wrench, the combination, with a handle perforated through its entire length and threaded internally, of a screw-rod fitted within the threaded perforation in the handle and adapted to operate the adjustable` jaw, substantiallyin the manner described.

2. In a tap-wrench, a jaw having opposite IOO lateral anges adjacent to one side anda dovesubstantially in the manner and for lthe purtailed slot on the opposite Side, Which repose specified.

ceves a corresponding dovetailed key as and for the purpose specified. ROBERT WOLFE' 4 5 3; In an adjustable tap-Wrench, the eomb- Witnesses:

nation of the perforated handle B', the serew- Y GEORGE M. GRUM,

rod Z, and the movable jaw d', al1 arranged WALTER POND. 

